Articles | Volume 33, issue 1
Ann. Geophys., 33, 25–29, 2015

Special issue: Observation, analysis and modelling of solar and heliospheric...

Ann. Geophys., 33, 25–29, 2015

Regular paper 07 Jan 2015

Regular paper | 07 Jan 2015

Physics of outflows near solar active regions

D. J. Price and Y. Taroyan D. J. Price and Y. Taroyan
  • Aberystwyth University, Physical Sciences Building, Aberystwyth, SY23 3BZ, UK

Abstract. Hinode/EIS observations have revealed outflows near active regions which remain unexplained. An outflow region observed by the EUV Imaging Spectrometer (EIS) that appears slightly redshifted at low temperatures and blueshifted at higher temperatures is presented. We conduct simulations and use those to create synthetic line profiles in order to replicate the observed line profiles of an apparent open structure. The results of the forward modelling support a scenario whereby long loops consisting of multiple strands undergo a cyclical process of heating and cooling on timescales of approximately 80 min.

Short summary
Magnetic structures are important for studies of solar atmospheric heating. Combining computer simulations with observations of the Sun provides us with information not obtainable from pure observation. We use this to suggest and interpret the physical nature of a particular structure which is permeated by a continuous outflow of plasma. It is shown that the structure consists of multiple strands which undergo periodic heating and cooling.